[OpenApi] Ignore unknown HTTP methods

[martincostello]

Ignore unknown HTTP methods

• Ignore unknown HTTP methods from OpenAPI documents.
• Generate OpenAPI operations for HTTP QUERY.

Description

Exclude unsupported HTTP methods from the OpenAPI document, rather than throwing an exception.

Fixes #60914.

[Copilot]

Pull Request Overview

This PR modifies the OpenAPI document generation to gracefully handle unknown HTTP methods by ignoring them instead of throwing exceptions. The changes allow the system to continue processing supported HTTP methods while silently skipping unsupported ones.

• Modified GetHttpMethod() to return HttpMethod? instead of throwing for unknown methods
• Updated OpenAPI document service to skip operations with unsupported HTTP methods
• Removed test that verified exception throwing for unknown methods
• Added sample controller methods with unsupported HTTP methods for testing

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
ApiDescriptionExtensions.cs	Changed GetHttpMethod() to return nullable and return null for unknown methods
OpenApiDocumentService.cs	Added null checks to skip operations with unsupported HTTP methods
ApiDescriptionExtensionsTests.cs	Removed test verifying exception for unknown HTTP methods
TestController.cs	Added sample methods with unsupported HTTP methods for testing

Comments suppressed due to low confidence (1)

src/OpenApi/src/Services/OpenApiDocumentService.cs:260

• [nitpick] Remove the unnecessary blank line. According to the coding guidelines, ensure proper formatting by avoiding extra blank lines.

        return paths;

[captainsafia]

LGTM!